Advanced Bash−Scripting Guide

Advanced Bash−Scripting Guide
echo; echo
escape=$'\033'
# 033 is octal for escape.
echo "\"escape\" echoes as $escape"
# no visible output.
echo; echo
exit 0
\"
\$
\\
See Example 35−1 for another example of the $' ' string expansion construct.
gives the quote its literal meaning
echo "Hello"
# Hello
echo "\"Hello\", he said." # "Hello", he said.
gives the dollar sign its literal meaning (variable name following \$ will not be referenced)
echo "\$variable01" # results in $variable01
gives the backslash its literal meaning
echo "\\" # results in \
The behavior of \ depends on whether it is itself escaped, quoted, or appearing within command
substitution or a here document.
# Simple escaping and quoting
echo \z
# z
echo \\z # \z
echo '\z' # \z
echo '\\z'
# \\z
echo "\z" # \z
echo "\\z" # \z
# Command substitution
echo `echo \z` # z
echo `echo \\z` # z
echo `echo \\\z` # \z
echo `echo \\\\z` # \z
echo `echo \\\\\\z` # \z
echo `echo \\\\\\\z` # \\z
echo `echo "\z"` # \z
echo `echo "\\z"` # \z
# Here document
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